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They said they did so because they were sitting around in their underwear watching a Grammy show on TV, hoping some day they might be on that stage, when it occurred to them if they ever did win a Grammy they should accept it as they were dressed then.

Not to be outdone, James Corden followed them onstage in his boxers.

Corden said he had vowed that if he ever got to host the Grammys he'd appear pantless too.